Poor Service after being a loyal customer for 6 years, shame on you Cell C

Good day.

I have been a loyal customer of Cell C for 6 year. Away paying my account. I have upgraded my contract just after Christmas, and in the second week I have already starting to experience problems with my new Samsung Note 20 (Camera warning, camara failed, or screen stays black). I phone into the Cell C Mall of the North Branch; they could not assist me over the phone said it could be an app running in the background. I work in Mokopane, 90km away from the branch going into the branch is difficult. I google and see if I can identify the app that might be causing the problem. I could not fix it. I went into the branch on Saturday, they said they do not have a technician on site, and they will see how to assist me after 15 min of waiting they said someone from Samsung will come and assist after 10 min. After 30 Min returning to the store, they started software updates, and I must wait for 9 hours to finish. This is ridiculous, why do software take so long to update. Are they using the internet of the branch for something else? I told them I will finish the update at home. At home, the software updated finished. I could not make calls, receive call, send sms, use date, anything. Trying to phone the branch from home, they said the lady that assisted me is on lunch, they did not even try to assist me with a different person. I AM STILL WAITING FOR THEM TO RETURN MY CALL. I had to phone Cell C customer service to assist me, and they did a great job. I had to go back on Sunday, spend another half day in the Mall, and not even replacing the phone for me after this is one of the more expensive contracts and the phone barley 3 weeks old, with no scratches. Sending in the phone and I have to be phone less for 21 working day. Really???? I want this Upgrade to be cancelled and Samsung to take back the phone, and then I will decide if Cell C still deserve me as a loyal customer and being treated this way.